Pro-Russian activists

Pro-Russian activists

AFP / AFP/Getty Images

Pro-Russian activists who seized the main administration building in the eastern Ukrainian city of Donetsk hold Russian flag and the flag of so called Donetsk Republic on April 7, 2014. They proclaimed Monday the creation of a sovereign "people's republic" independent of Kiev rule. The Interfax news agency reported that the self-proclaimed leaders of Donetsk vowed to hold a regional sovereignty referendum no later than May 11.

Pro-Russian activists who seized the main administration building in the eastern Ukrainian city of Donetsk hold Russian flag and the flag of so called Donetsk Republic on April 7, 2014. They proclaimed Monday the creation of a sovereign "people's republic" independent of Kiev rule. The Interfax news agency reported that the self-proclaimed leaders of Donetsk vowed to hold a regional sovereignty referendum no later than May 11. (AFP / AFP/Getty Images)

Pro-Russian activists who seized the main administration building in the eastern Ukrainian city of Donetsk hold Russian flag and the flag of so called Donetsk Republic on April 7, 2014. They proclaimed Monday the creation of a sovereign "people's republic" independent of Kiev rule. The Interfax news agency reported that the self-proclaimed leaders of Donetsk vowed to hold a regional sovereignty referendum no later than May 11.